Group A beta-hemolytic streptococcus causes immune-mediated disorders such as acute rheumatic fever and acute glomerulonephritis. We describe a second patient with Fisher's syndrome (FS) from whom beta-hemolytic streptococcus was isolated. We performed a study of the antecedent pharyngeal symptoms in FS and Guillain-Barré syndrome. Sore throat was statistically more frequent in FS (18/24 cases, 75%) than in Guillain-Barré syndrome (29/58 cases, 50%). In a series, however, the association of FS with group A streptococcal infection was not shown. Some patients may develop FS after group A streptococcal infection, but the bacterium is not a major antecedent agent in FS.